Brush sander head



June 21, 1949. H. s. NEWTON 2,474,063

BRUSH SANDER HEAD 2 Sheets-Sheehl Filed May 6, 1948 Herman 5. lVeu/fan' INVENTOR.

ATTORNEY June 21, 1949 H. s. NEWTON 2,474,063

BRUSH SANDER HEAD Filed May 6, 1948 2 Shets-Sheet 2 er/nan 5. New/on 1N VEN TOR.

ATTORNEY Patented June 21, 1949 UNITED STATES PATENT OFFICE BRUSH SANDER HEAD Herman S. Newton, Temple, Tex.

Application Mayfi, 1948, Serial No. 25,401

6 Claims.

This invention relates to sanding drums and more particularly to rotary brush sanders.

The principal object of the invention is to provide an improvement in brush sanders of the type having alternate brushes and abrasive strips, in which the latter are replaced when worn, by the simultaneous unwinding of a plurality of strips coiled on the core of the sander. Most important however, among the objects of the invention is to simplify the construction of such a brush sander, as well as the servicing thereof, that is to say, the replenishing of used abrasive material, and thus reduce materially the original cost of the sander and the time consumed in installing and adjusting the abrasive strips.

The invention provides a belt grooved driving head having a multiplicity of annularly spaced, circular cavities receiving the ends of an equal number of longitudinally split tubes, disposed perpendicularly to the plane of the head and adapted to retain brush mountings. A retainer ring similarly equipped to receive the opposite ends of the tubes is held in position by a reel cap, the latter, in conjunction with the driving head, holding an abrasive re'el on which is wound the abrasive anchoring flaps of a fabric spider. The assembly as a whole constitutes a compartively simple arrangement in which abrasive surfaces may be quickly and expediently renewed.

With the foregoing objects in view, the invention has further reference to certain features of accomplishment which will become apparent as the description proceeds, taken in connection with the accompanying drawings wherein:

Figure 1 is a perspective view of a brush sander constructed according to the invention.

Figure 2 is a detail view of the abrasive anchoring spider.

Figure 3 is a transverse sectional view of the sander on a slightly larger scale, taken through the midsection thereof.

Figure 4 is a longitudinal sectional view thereof, and

Figure 5 is a fragmentary perspective view of the anchorage between a strip of abrasive and flap of the spider.

Continuing with a more detailed description of the drawing, reference numeral I0 denotes a driving head having a belt groove H therein to receive a belt by which the sanding head is driven. Spaced about the perimeter of the driving head It] in its inner face is a multiplicity of annular spaced, circular recesses 12 which are adapted to receive the ends of an equal number of longitudinally slotted tubes l3, the slots of the tubes facing outwardly. Set screws l4 enter radial holes in the head and aligned holes in the tubes I3 to secure the latter against rotative and longitudinal displacement with respect to the head Ill.

Brushes l5 are of conventional manufacture and each set of bristles is anchored in a metal mounting bar 16. These mounting bars are slid longitudinally into the tubes l3, the bristles extending through the slots in the tubes, as shown in Figure 4. To insure rigidity of the brushes in relation to the tubes I3, stabilizing wedges H are inserted in the tubes under the brush mounting bars 16.

Opposite the driving head It is a retaining ring [8 having an internal bevel l9 and is provided with an annular series of circular recesses 20 corresponding to the recesses l2 in the driving head Ill and which receive the opposite ends of the brush holders or tubes 13. A cap 2|, having an external bevel 22, is mounted on the spindle 23 of the mounting shaft 24 and its bevel 22 corresponds to and bears frictionally against the bevel I!) of the retainer ring [8, thus holding the latter in concentric relationship with the shaft spindle 23. The end of the spindle 23 is threaded to receive a nut 25 which holds the cap 2! compressedly against the ring l8 and otherwise maintains the parts in assembled relationship.

The driving head 10 has a boss 26 formed on its inner face which is in confronting relationship with a similar boss 21 formed on the inner face of the cap 2i. These bosses serve jointly as a mounting for a reel 28 which is frictionally retained thereon with the boss 2'! and cap 2! by means of a key 29, partially retained in a recess adjacent the boss 21 and extending into a slot 30 in the end of the reel 28.

In Figure 2 is shown an end elevational view of a spider, consisting of strips of fabric or other material formed into substantially U-shape to provide flaps 3!. The individual strips are sewed or otherwise secured together at a to define a circular sleeve which is slid onto the reel 28 and secured thereto by brads or rivets b.

In Figure 5 is shown the manner in which strips 32 of abrasive meterial are secured to the flaps 3| of the spider shown in Figure 2. As shown, staples 33 are employed but it has been found that adhesive tape is equally as suitable for the purpose.

To install the abrasive strips in the head, a number of such strips are cut in predetermined length and secured at their ends, as described, to the ends of the spider flaps 3 I. The spider is then slid onto the reel 28 which has previously been installed in the head. The free ends of the strips are passed between the brush mounting tubes I3, whereupon the cap 2| is mounted on the spindle 23. By inserting a suitable tool in a, hole 34 in the hub of the cap 2! the latter may be rotated to turn the reel 28 to wind the extended strips 32 of abrasive material onto the reel 28 in overlapping relationship until the extremities of the strips lie on a plane with or adjacent to the ends of the brushes 15. When the desired positionof the strips is obtained, the nut 25 is tightened to bring the bevel 22 of the cap 2! firmly against the corresponding bevel IQ of the retaining ring. [8-, thus looking all parts securely together.

When the extended portions of the abrasive strips 32 become too worn for effective use, the

nut 25 is loosened and the cap 2| is rotated to unwind the strips and thus extend sufiicient unused portions thereof as will meet requirement, afterwhich the used portions of the strips are out old. This operation can be accomplished quickly with but neglible loss of time.

What is claimed is:

l. A brush sander including a driving head having a multiplicity of annularly-spaced cavities adjacent its perimeter, an equal number of longitudinally slotted tubes retained by their ends in said. cavities, a brush slidably mounted-in each of said. tubes, a. retainer ring having cavities corresponding to those of said driving head and receiving the opposite ends of said tubes, said ring further having a bevel on its inner periphery, a cap having a peripheral bevel corresponding to and bearing against the bevel of said retainer ring. to-secure the assembly for common rotation, a reel interposed between said head andcap and keyed to. said cap, a flexible spider on said. reel having radial flaps, an abrasive strip attached to eachof said flaps, said-abrasive strips being, wound collectively in overlapping relationship on said;

reel and extending radially between said! brushes and means for rotating said reel through the mediumofsaid. capto effect simultaneous adjustment of said abrasive strips in. relation tosaid brushes.

2. A brush sander including a driving head, a plurality of longitudinally slottedtubesretained at their ends in annularly spaced recessesadjae cent the perimeter of said head, an internally beveled. ring having recesses corresponding to those insaid head and retaining the opposite ends of said tubes, a brush mounted in eachof said tubes whose bristles extend through the slot thereof, a cap within and. concentric .tolsaid' ring;

having a beveled perimeter frictionally engaging, thevbevel. of said ring; to secure saidv head andcap: for common rotation, a reelextending between said head and cap, and to which the latter is keyed, a flexible spider aifixedto said reel: having radial flaps, an abrasive strip attached toeach.

of said-flaps andrwound on said reel, theends-ofsaid strips extending between said tubes and brushes and meanstoeflect rotation of. said capwhen disengaged from said ringto' rotates-aid.

reel to collectively adjust said abrasive stripsin relation to saidbrushes.

3. A brush sander comprising a driving head mounted on a shaft, a series of annularly spaced and longitudinally slotted tubes whose ends are retained in perpendicular relationship to the inner face of said head, a ring retaining the opposite ends of said tubes and having a beveled inner periphery, a cap having a beveled periphery engaged with that of said ring to hold the elements ofsaid'sander in rigid assembly, a brush retained in each of said tubes whose bristles extend through the slot therein, a real disposed axially between said head and cap and rotatable by the latter, a plurality of abrasive strips having a common anchorage to said reel and wound thereon in overlapping'relationship by rotation of said cap when the latter is disengaged from said ring, and whose ends protrude between said tubes and brushes and means-for securing said cap against rotation.

4. A rotary brush sander including a driving head mountedon a shaft and a ring, a circumferential series ofl longitudinally slotted brush. taining tubesheld betweensaid head and ring, a-brush ineach of said tubes whose bristles extend radiall-ythrough the slot therein, a cap whose periphery is: in frictional contact with the. inner periphery of. said ring for holding the latter in concentric relation to said shaft, a reel surround.- ingsaid shafltbetween sand head and cap, a pluralityof fabric. strips joined: one to theother at spacedapart pointsmidway between their endsto define a. cylindrical sleeve receivable. on said reeland a plurality of radial flaps, an: abrasive strip attached to. each of the radial flaps of said cylinder, saidl strips being wound onsaid: reel collectively in overlapping relationship through rotation of said cap in disengaged relationship withsaidring and whose ends-extend; radially be tweensaid tubes and brushes and means on the endmof said shaft for holding said in fixed. relationship therewith.

5. A bruslrsander as set forth in claim 4 in which the engaging surfacesto the ring. cap. are correspondingly beveled to maintain con-- centricity thereof in fixed position of said and-to securethe elements-ofthebrush sander in rigid. relationship. I

6. A. brush sander'as'in claim 4, in which the head and ring, are each: provided with annula spacedrecessesin their confronting faces'reccring opposite ends of the. series of brush'retaining tubes and. means for securing the. ends of tubes. in the recesses of said. head to-hold them against longitudinal androtative displacement. HERMAN -S.- NEWTON.

REFERENCES CIZCED The following referenlce-s are of record inthe file of this. patent;

UNITED SI'ATE'SJ PATENTS Number' Name Date 2,194,577 Vonnegut Mar. 28; 1340 2,418,966 Bonkowskil Apr. l 5,.'1" 94 7 2x1301399 Bradley Nov. 4', L947 2,443,413 Bonkowski June: I was 

